Chronic motor tic disorder

Alternative names:

chronic vocal tic disorder

Definition:

A disorder characterized by rapid, recurrent motor movements or vocal outbursts (but not both) that have been present nearly every day for more than a year.

Causes, incidence, and risk factors:

The incidence of chronic motor or vocal tic disorder is greater than Tourette's Disorder. The incidence of this disorder range from 1 to 2%. It is, however, rare compared to the common short-lived childhood tic (transient tic disorder). Tics appear to get worse during emotional stress and are absent during sleep. The cause is unknown.